Bad sectors on an old hard drive can eat your data.
It can even attempt repairs on encrypted archives , provided you have the password. Quick Fix: The "Alt + R" Method advanced-rar-repair-1-2-full-version
Before you download extra software, try the built-in fix in WinRAR: Bad sectors on an old hard drive can eat your data
Repair a whole folder of corrupted archives at once. advanced-rar-repair-1-2-full-version